fix(mcp): tag legacy provider calls with audit context

apps/api/src/plugins/mcp/mcp_bridge.py

@@ -24,6 +24,7 @@ from typing import Any
 import httpx
 
 from src.core.config import settings  # P0-13: K8s namespace 由 settings.AWOOOI_K8S_NAMESPACE 提供
+from src.services.mcp_audit_context import with_mcp_audit_context
 from src.utils.timezone import now_taipei
 
 logger = logging.getLogger(__name__)
@@ -518,6 +519,13 @@ class MCPBridge:
                 raise ValueError(f"Unknown MCP Server: {server_name}")
 
             server = self._servers[server_name]
+            parameters = with_mcp_audit_context(
+                parameters,
+                session_id=f"mcp_bridge:{execution_id}",
+                flywheel_node="govern",
+                agent_role="mcp_bridge",
+                gateway_path="legacy_mcp_bridge",
+            )
             result = await self._execute_tool(server, tool_name, parameters)
 
             # ========================================